Process of producing filling material.



UNITED STATES PATENT OFFICE- v JOHN D. PENNOOK, OF SYRACUSE, NEW YORK, ASSIGNOR TO THE SOLVAY To all whom it may concern.-

' acid PROCESS COMPANY, A CORPORATION OF PROCESS OF PRODUCING FILLING M NEW YORK. ATEFIIAL.

Specification of Letters Patent. Application filed June 8, 1904. Serial No. 211,639.

No. 805,581. Patented Nov 28, 1905.

provide a concentrated solution of calcium chlorid either by dissolving the soluble calcium chlorid or b T concentrating to 40 Baum the waste liquors from distillers of the ammonia-soda process. Into this solution I pass carbonic acid and dry ammonia simultaneously, maintaining the temperature of said solution preferably at approximately 80 centigrade and continuing the action of the carbonic-acid and ammonia gas until all the calcium of the calcium chlori is precipitated as calcium carbonate. After the settling at 80 centigrade of the precipitated calcium carbonate the ammoniumchlorid solution may be decanted to a crystallizing-reservoir, where the bulky crystallization of ammonium chlorid as a by roduct takes place. The precipitated ca cium carbonate may then be filtered and washed and then dried with the air at a temperature Be it known that I, JOHN D. PENNOCK, a citizen of the United States, residing at Syra-. cuse, in the county of Onondaga and State of New York, have invented a new and useful Process of Producing a Filling Material, of which the following is a specification.

My invention relates to improvements in the process of producing a filling material.

-The object of my invention is to manufacture from natural products a filling material free from im urities and by means which shall not rend er such production prohibitive by reason of its cost.

Recent industries utilize in very consider-' able quantities materials which are naturally inert from the chemical oint of view, but which by reason of their physical qualities of color, fineness, homogeneity, &c., are useful as vehicles or filling mater als in the manufacture of rubber, paint, aper, plaster, &c. preferably of approximately 80 centigrade. such, for'example, as s fateof lime, sulfate By this process a large yield may be obof baryta, kaolin, chalk, &c. tained of a ure by-product of ammonium- The object of my invention is the artificial production of one of these materialscalcium carbonate. This chemically is the same as the ground natural roduct chalk and limestone; but both of these materials when I chlorid abso utely free from other salt by simply cooling down to the temperature of ithedatmosphere and without evaporation in The precipitated chalk is in the form of arragonite and not calcite. Arragonite is the form which is desirable By varying the temperatures the concentration, the rapidity of mixture, agitation, or introducing foreign salts it is possible to largely influence the physical character of the precipitates, and thus several degrees of fine- .ness may be obtained.

ground or even floated contain impurities which make them unsuitable for particular purposes and are of a different form of crystallization from the one herein described.

My process,'on the contrary, consists in causing these materials to enter into a chemical combination which ermits me to deal only with a compound o pure calcium, then by means of an appropriate precipitation to What I claim iswithdraw them from such combination. In 1. The process of producing a filling matetnis manner is obtained a substance which is rial, which consists in assing carbonic acid and dry ammonia simultaneously into a concentrated solution of calcium chlorid, main- .tainingat a suitable temperature the solution and continuing the action of the carbonic-acid gas and the ammonia as until all the calcium of the calcium chlori is precipitated as calcium carbonate.

2.- The process of producing a filling material,'which consists in passing carbonic acid and dry ammonia simultaneously into a concentrated solution of calcium chlorid, maintaining at a suitable temperature the solution, continuing the action of the carbonicacid gas and the ammonia gas until all the perfectly white and v of extreme with a possibility of varyin cording to the conditions 0 tion and according to the uses product is intended.

e roduct obtained by my process is soft, flaky, and light, due to the gradual precipitation made possible by the introduction of gases into a soluble salt of calcium. Said product is especially adapted to a wide range of commercial use-such, for instance, as in the manufactures above referred to.

y process consists in passing carbonicand ammonia gas simultaneously into a concentrated solution of calcium chlorid. I

lightness, the grain acthe precipitafor which the calcium of the calcium chlorid is precipitated tated as calcium carbonate, and

as calcium carbonate, andfiltering and washing the precipitated calcium carbonate.

3. The process of producing a filling material, which consists in passing carbonic acid and dry ammonia simultaneously into a concentrated solution of calcium chlorid, maintaining at a suitable temperature the solution, continuing the action of the carbonic acid gas and the ammonia gas until all the calcium of the calcium chlorid is precipitated ascalcium carbonate, and filtering, washing and drying the precipitated calcium carbonate.

4. The process of producing a filling material, which consists in passing carbonic acid and dry ammonia simultaneously into a concentrated solution of calcium chlorid, maintaining at a suitable temperature the solution, continuing the action of the carbonicacid gas and the ammonia gas until all the calcium of the calcium chlorid is fiprecipitering, washing and drying the precipitated calcium carbonate with the air heated to a'suitable temperature.

5. The process of producing a filling mate- I chlorid solution to a crystallizing-reservoir,

rial, whic consists in assing carbonic acid and dry ammonia simu taneously into a concentrated solution of calcium chlorid, maintaining at a suitable temperature the solution, continuing the action of the carbonicacid gas an the ammonia gas until all the calcium of the calcium chlorid is precipitated as calcium carbonate, settling at suitrial, which consists in able temperature and decanting the animon1um-chlorid solution to a crystallizing-reservoir.

6. The process of producing a filling material, which consists in assing carbonic acid and dry ammonia simu taneously into a concentrated solution of calcium chlorid, maintaining at a suitable temperature the solution, continuing the action of carbonic-acid gas and the ammonia gas until all the calcium of the calcium chlorid is precipitated as calcium carbonate, settling at a suitable temperature and decanting the ammoniumchlorid solution to a crystallizing-reservoir, and filtering and washing the precipitated calcium carbonate.

7. The process of producing a filling mateassing carbonic acid and dry ammonia simultaneously into a concentrated solution of calcium chlorid, maintaining at a suitable temperature the solution, continuing the action of the carbonicacid gas and the ammonia gas until all the calcium of the calcium chlorid is precipitated ascalcium carbonate, settling at a suitable temperature and decanting the ammoniumand filtering,washing and drying of the cipitated calcium carbonate.

JOHN D. PENNOCK.

pre-

Witnesses:

H. A. FLINT, EFJ. DAVIS. 

